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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1122fb7cd6204c31d5d9d26ea2c11b2a7fe761abe01a9098e617bddb93ec1eb4' 
  AND token = '93XfmY69yQLIUjEjmzGuiZ1itOm0wwDRZRvC21cVKq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}